Question

Classifying things by observation can best be done using a

Answer 1

Taxon. 
Taxon divided organisms into different groups based on their likeness which is the best way to classify things.

Answer 2

Answer:

classification system

Explanation:

All the living things are different, but if you want to classify them, you need to have some characteristics in common, for example, if they have shell or skin, if they reproduce sexual o by asexual means. If they are plants, the shape of the leaves is a criteria, also if they have flowers or not, etc.